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Experiment 4 - The Incandescent Light Bulb

In an incandescent lamp bulb you find a thin wire having a resistance of only a few ohms. In the circuit, the wire heats up so much by the current flowing through that it starts to glow.

Circuit with light bulb. (Enlarge)

Circuit diagram of the circuit with light bulb.

How much current flows through a resistor at a fixed voltage is described by Ohm's law. How much heat is generated at a resistor is described by Joule's law.

In the next steps are you looking at what changes in a circuit if you use multiple resistors.

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